Service manual

G420F(FE) Service Manual Chapter 3. Engine Mechanical System 81
DISASSEMBLY
1. Remove the relief plunger.
Remove the plug (A), spring (B) and relief plunger
(A).
INSPECTION
1. Inspect relief plunger.
Coat the valve with engine oil and check that it
falls smoothly into the plunger hole by its own
weight.
If it does not, replace the relief plunger. If
necessary, replace the front case.
2. Inspect relief valve spring.
Inspect for distorted or broken relief valve spring.
43.8mm
Free height
(1.724in.)
3.7kg/40.1mm
Standard
value
Load
(8.14lb/1.579in.)
3. Inspect rotor side clearance.
Using a feeler gauge and precision straight edge,
measure the clearance between the rotos and
precision straight edge.
0.04~0.09mm
Outer gear
(0.0016~0.0035in.)
0.04~0.085mm
Side
clearance
Inner gear
(0.0016~0.0033in.)
If the side clearance is greater than maximum,
replace the rotors as a set. If necessary, replace the
front case.
4. Inspect rotor rip clearance.
Using a feeler gauge, measure the tip clearance
between the inner and outer rotor tips.
Tip clearance
0.025~0.069mm
(0.0010~0.0027in.)
If the tip clearance is greater than maximum, replace
the rotor as a set.